Improved apparatus for the manufacture of salt



C. D. GARRISON.

Manufacturing Salt.

Patented I Aug. 19, 1862.-

11w 5mm 7';

W'iweses N. PETERS. Phnm-Limo m mr, Wlslungton, DJ;

UNITED STATES O. OHGARRIS ON, OF EAS T SAGINAWV, MICHIGAN.

IMPROVED APPARATUS FOR THE MANUFACTURE OF SALT.

Specification forming part of Letters Patent N0. 36,521 I, dated August 19, 1862.

T 0 all whom it may concern Be it known that I, O. O. GARRISON, of East Saginaw, in the county of Saginaw and State of Michigan, have invented a new and Improved Salt Apparatus; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forminga part of this specification, in which- Figure 1 represents a transverse vertical section of my invention, taken in the plane indicated by the line a: m, Fig. 2. Fig. 2 is a plan or top view of the same. Fig. 3 is a transverse vertical section of one of the vats.

Similar letters of reference in all the views indicate corresponding parts.

This invention consists in the arrangement of false metal bottoms resting on ribs projecting from the regular bottoms of the pans of a salt-block in such a manner that a space'is formed which can be filled with steam or hot air, and that the salt-brine passing through said pans is evaporated entirely by the action of the hot air or steam. It consist,further, in the arrangement of a graduation and purifying range, consisting of a long fiat trough with longitudinal partitions forming a zigzag channel, in combination with the preliminary heating-pan above and a series of finishing-pans below in such a manner that the brine, after being heated in the preliminary pan,is passed through the purifying-range, where the same presents a large evaporating-surface, and consequently readily deposits its impurities before it passes to the finisl'iing-pans. It consists, finally, in giving to the finishing-pans a laterally-inclined position, so that the bitterns can easily be drawn off when it is desired to dry the salton the pans.

To enable those skilled in the art to make and use my invention, I will'proceed to de: scribe its construction and operation with reference to the drawings.

A series of pans, A B O D, are arranged side by sides and one above the other, as shown in the drawings, or the finishing-pans B G D may be placed on the same level, but lower than the preliminary pan A. Each of these pans is provided with a false bottom, a, which rests on ribs I), projecting from the regular bottom 0. These false bottoms are firmly connected to the sides of the pans, so as to prevent leakage of thebrine down to the spaces between the two bottoms. These spaces communicate by means of pipes d with a steamboiler, E, or they may be supplied with hot air, and the heat thus conveyed to the metal bottoms is rapidly conveyed to the brine which may be introduced into the pans. The pipes d are provided with stop-cocks 0, so that the current of steam or hot air through either of the pans can be regulated at pleasure. The brine is first admitted into the preliminary pan A, and when heated to the desired temperature it is run off through the pipe f into the range or trough F. This trough extends from one end of the salt-block to the other, and it is provided with a series of horizontal partitions, g, which form a zigzag passage, 71 from its receiving end to the discharging side. In passing through the passage the heated brine presents a large evaporatingsurface, so that the impurities contained in the same precipiiate, and at the same time the brine is graduated. From the trough F the brine passes through pipes a into the finishing-pans B CD, which may be arranged one above the other, as shownin the drawings, or on the same level, but sufiiciently low to permit the brine to'fiow from the graduation-trough into each pan. In these pans. the evaporation is continued to the desired point, and then the bitterns are drawn off through holes in pipes j in the sides of the pans; and in order to be able to draw off the bitterns without trouble thepans B O D are inclined laterally, as clearly shown in Fig. 3. By these means the crystals can be retained in the pans and separated from the bitterns in a very simple and easy manner,

and the salt can be dried in the same pans in l which the evaporation has been finished.

It is obvious that the number of finishing; pans and the length of the purifying and graduation range can beincreased at pleasure, and when it is desirable two or more boilers can be used to supply the requisite quantity of steam; or, instead of steam, hot air might be used which might be heated in any desirable manner. With this apparatus the evaporation of brine can be effected very quick and with little labor, and with a comparatively tmall quantity of fuel. Having thus fully described my invention, What I claim as new, and Letters Patent, is

1. The arrangement of the false metal botdesire to secure by toms a, inserted into the pans A B G D of a 3. Giving the finishing-pans B C-Dalateral sa1t-b10ck, and resting on ribs 1), projecting inclination, as and for the purpose set forth. from the bottoms c of said pans, substantially 1 as and for the purpose described. 0. O. GABRISON.

2. The arrangement of the graduation and purifying range F, in combination with the \Vitnesscs: pans A B O D, constructed and operating sub- 1?. GLYNN,' stantiaily as and for-the purpose specified. L. G. VVHITING. 

